THE ORDER CETACEA. 



171 



another very short cone, the base of which is closely 

 united to that of the former ; it is slightly inflated above 

 the eyes, which are small and situated at the same ele- 

 vation as the division of the lips ; the iris is yellow and 

 the pupil triangular. Beyond the organ of vision, and at 

 a small distance, is that of hearing, but which from its 

 diminutiveness is difficult to distinguish. 



The tongue is broad, soft, and flat, and apparently 

 indented at its edges. 



The orifice of the two spiracles is in the form of a 

 crescent, whose convexity faces the tail. The respira- 

 tory organ is placed above the space comprised between 

 the eye and the aperture of the mouth. 



The pectoral fin, the bones of which are represented 

 in the above engraving, bears a great resemblance to 

 the human hand ; it is situated very low, and almost 

 three-twentieths of the entire length of the animal ; the 

 caudal, about one-fourth of the same, has two large 

 sloping lobes, from the middle of the division of which 

 proceeds a longitudinal projection, extending over the 

 back as far as the dorsal fin. This tail, with the assist- 

 ance of these vast lobes, forms a powerful lever, and 



